code: def test_racah():
      assert racah(3, 3, 3, 3, 3, 3) == Rational(-1, 14)
      assert racah(2, 2, 2, 2, 2, 2) == Rational(-3, 70)
      assert racah(7, 8, 7, 1, 7, 7, prec=4).is_Float
      assert (
          racah(5.5, 7.5, 9.5, 6.5, 8, 9) == -719 * sqrt(598) / 1158924
      )
      assert abs(
          racah(5.5, 7.5, 9.5, 6.5, 8, 9, prec=4) - (-0.01517)
      ) < S("1e-4")
  
file_path: sympy/sympy/physics/tests/test_clebsch_gordan.py
imports: from sympy.core.numbers import I, pi, Rational
  from sympy.core.singleton import S
  from sympy.core.symbol import symbols
  from sympy.functions.elementary.exponential import exp
  from sympy.functions.elementary.miscellaneous import sqrt
  from sympy.functions.elementary.trigonometric import cos, sin
  from sympy.functions.special.spherical_harmonics import Ynm
  from sympy.matrices.dense import Matrix
  from sympy.physics.wigner import clebsch_gordan, wigner_9j, wigner_6j, gaunt, real_gaunt, racah, dot_rot_grad_Ynm, wigner_3j, wigner_d_small, wigner_d
  from sympy.testing.pytest import raises
label_desc: Use image node_id 6 for calling a global function with example usage: test_racah() without return types